Toshiba nv Series - Application as a Self Diagnosis Counter

3.2. Operation of the speed counter
8ch Pulse Input Module PI918 Functional Manual
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3.2.1. Application as a self diagnosis counter
Itcountsandholdsinternalreferencepulsesatcertaincycleswithout
externalinputconnection.
Ifitalwayshasafixedvalue,theinternalcircuitoperationcanbe
determinedasnormal.
Condition：
Parameter
setting
EP AL SP SV
0 0 1 0
External
input
Pulseinput Gateinput
Notrequired Invalid

 Operation：
(1) Afixedvaluedeterminedbasedoninternalreferencepulsesand
samplingcycleissettotheholdregister.  However,theholdvalue
isnotguaranteeduntilthetimeuptotwotimesthesamplingcycle
elapsesafterstartup.
Figure 3.2.1. Example of self diagnosis counter operation
Internal
referencepulse
Countvalue
0
Startup(parameter
downloadcomplete)
Sampling
A
B
T
Holdvalue
0
2T(max.)
(Indefinite
id)
B(Specifiedvalue)
A
 f=Referencepulsefrequency(Hz)
T=Samplingcycle(s)
B=fxT